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Derivative Instruments (Gross Notional Amount and Fair Value of Derivatives Contracts) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Derivative [Line Items]    
Notional Amount $ 17,380,622 $ 15,904,127
Carrying Value / Fair Value of Assets 307,303 320,724
Derivative Liability, Fair Value, Gross Liability 937,691 1,058,727
Not Designated as Hedging Instrument    
Derivative [Line Items]    
Notional Amount 15,574,135 14,243,031
Carrying Value / Fair Value of Assets 252,115 254,252
Derivative Liability, Fair Value, Gross Liability 911,275 1,022,122
Not Designated as Hedging Instrument | Interest Rate Swap [Member]    
Derivative [Line Items]    
Notional Amount 1,074,173 996,204
Carrying Value / Fair Value of Assets 37,238 59,809
Derivative Liability, Fair Value, Gross Liability 1,818 2,372
Not Designated as Hedging Instrument | Financial Futures    
Derivative [Line Items]    
Notional Amount 347,916 412,438
Carrying Value / Fair Value of Assets 0 0
Derivative Liability, Fair Value, Gross Liability 0 0
Not Designated as Hedging Instrument | Foreign Currency Forwards    
Derivative [Line Items]    
Notional Amount 0 6,030
Carrying Value / Fair Value of Assets 0 0
Derivative Liability, Fair Value, Gross Liability 0 28
Not Designated as Hedging Instrument | Consumer Price Index Swap [Member]    
Derivative [Line Items]    
Notional Amount 409,023 221,932
Carrying Value / Fair Value of Assets 127 0
Derivative Liability, Fair Value, Gross Liability 2,836 2,160
Not Designated as Hedging Instrument | Credit Default Swaps    
Derivative [Line Items]    
Notional Amount 1,373,300 961,200
Carrying Value / Fair Value of Assets 6,759 8,319
Derivative Liability, Fair Value, Gross Liability 114 1,651
Not Designated as Hedging Instrument | Equity Options    
Derivative [Line Items]    
Notional Amount 571,845 632,251
Carrying Value / Fair Value of Assets 19,372 23,271
Derivative Liability, Fair Value, Gross Liability 0 0
Not Designated as Hedging Instrument | Longevity Swap [Member]    
Derivative [Line Items]    
Notional Amount 928,320 960,400
Carrying Value / Fair Value of Assets 46,090 40,659
Derivative Liability, Fair Value, Gross Liability 0 0
Not Designated as Hedging Instrument | Mortality Swap [Member]    
Derivative [Line Items]    
Notional Amount 25,000 0
Carrying Value / Fair Value of Assets 0 0
Derivative Liability, Fair Value, Gross Liability 308 1,683
Not Designated as Hedging Instrument | Embedded Derivatives In Modified Coinsurance Or Funds Withheld Arrangements    
Derivative [Line Items]    
Notional Amount 0 0
Carrying Value / Fair Value of Assets 142,529 122,194
Derivative Liability, Fair Value, Gross Liability 0 0
Not Designated as Hedging Instrument | Embedded Derivatives In Indexed Annuity [Member]    
Derivative [Line Items]    
Notional Amount 0 0
Carrying Value / Fair Value of Assets 0 0
Derivative Liability, Fair Value, Gross Liability 815,970 861,758
Not Designated as Hedging Instrument | Embedded Derivatives In Variable Annuity [Member]    
Derivative [Line Items]    
Notional Amount 0 0
Carrying Value / Fair Value of Assets 0 0
Derivative Liability, Fair Value, Gross Liability 90,229 152,470
Not Designated as Hedging Instrument | Synthetic Guaranteed Investment Contracts    
Derivative [Line Items]    
Notional Amount 10,844,558 10,052,576
Carrying Value / Fair Value of Assets 0 0
Derivative Liability, Fair Value, Gross Liability 0 0
Designated As Hedging Instrument    
Derivative [Line Items]    
Notional Amount 1,806,487 1,661,096
Carrying Value / Fair Value of Assets 55,188 66,472
Derivative Liability, Fair Value, Gross Liability 26,416 36,605
Designated As Hedging Instrument | Interest Rate Swap [Member]    
Derivative [Line Items]    
Notional Amount 435,000 435,000
Carrying Value / Fair Value of Assets 99 0
Derivative Liability, Fair Value, Gross Liability 20,579 20,389
Designated As Hedging Instrument | Foreign Currency Forwards    
Derivative [Line Items]    
Notional Amount 834,238 553,175
Carrying Value / Fair Value of Assets 8,948 1,265
Derivative Liability, Fair Value, Gross Liability 2,067 7,720
Designated As Hedging Instrument | Currency Swap [Member]    
Derivative [Line Items]    
Notional Amount 537,249 672,921
Carrying Value / Fair Value of Assets 46,141 65,207
Derivative Liability, Fair Value, Gross Liability $ 3,770 $ 8,496